Abstrakt
This monograph summarises development of motion-onset visual evoked potentials (VEPs). For evocation of the motion-onset specific N2 peak (latency of 160 - 200 ms) from the extra-striate temporo-occipital or parietal cortex, the following stimulus parameters are recommended: a low luminance (< ca 20 cd/m2) and low contrast (< ca 10% - sinusoidally modulated) of a moving pattern with low velocity and temporal frequency (< ca 6 Hz).
A short (up to 200 ms) duration of motion and a long (at least 1s) inter-stimulus interval reduce adaptation to motion and predominance of the pattern-related P1 peak. Slow maturation of the motion processing system (up to 18 years) and its early ageing requires age dependent latency norms.
The motion-onset VEPs increase sensitivity of electrophysiol. examinations in CNS disorders with early or selective involvement of the motion processing system (magnocellular system and/or the dorsal stream) of the visual pathway.